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Sometimes yellow turbidity appears while...

Sometimes yellow turbidity appears while passing `H_(2)S` gas even in the absence of II group radicals. This is because of

A

Sulphur is present in the mixture as impurity

B

IV group radicals are precipitated as sulphides

C

Of the oxidation of `H_2S` gas by some acid radicals

D

III group radicals are precipitated as hydroxides

Text Solution

Verified by Experts

The correct Answer is:
C
Such yellow turbidity in group II is due to the oxidation of `H_2S` to S by some oxidising anion (e.g., `NO_3`) present in the mixture.
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